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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710e60d41c570231aeae74805968849256f7071d1ff4a7e21dbe326d35c01bd4' 
  AND token = 'HfUfj3BnSieq3Evf/ojedZGGlW4DNGA8OifLnGwBEqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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