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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56e730c3ef9b71f99c9f2fd18448f150dd9721e290dc615f1febffa3679bcae' 
  AND token = 'tI19Tyu5wY3zVX+Yad+2rkJ2+3gWrgVIcBvYZ7DBM10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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