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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66793717e19ee8da2b5ca13f6ccc5f317adb5aa5d4f3b9d30c77c00dccd71fa7' 
  AND token = 'H7RhE2OUyDiSJ3/r3tBFGL3BXbGN1t9eOVLC6zByfJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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