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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcab1a17ffe530d1df5df911e76dc85d96acd8fa26517796afbea7f7287a8bd' 
  AND token = 'dBJIF7v0hCap+jx0dRmEpDbzo0gY/OdTHOy+Oprf6ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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