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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f58c635d4e38976626ac63061b7a36f4bf38ab25ef4d8eace8192626f8fe2ca' 
  AND token = 'tgY2BZHDIfEBgcrq6zMTLbOp/hUPxA3TLz43zybEyYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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