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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359f456011938649838cddb2c7d0288dc38200975a6cd9af8373983c06abd5f1' 
  AND token = 'y86n5HveYeVzXCyw55GO7ib9/3Shya8VIfe+gTq4qdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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