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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00bc9c6a91ac43948c4f64b87780991fa01fe37d34ae1df0d16df1c9ef87d267' 
  AND token = '3n176j1xO8SKDbpAtIkyfHPJlXQuZ393vub/Rz4BLyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}