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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba04d44f95f2476ffd4853b1671e81f0873e22897456a329d00554d142bb5726' 
  AND token = '+u2d1kvT0NlDv2AXPk8v1m1n+hOntVvBjPVUQMoR1fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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