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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2c56511d5a4805bbf8d381bd81dc8769637842d932baab2a17a83075ea5bc9' 
  AND token = 'J0n6AWDqjJn1XcH4T/IHegA+wIL+OFyRRrFxy08qGDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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