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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbb4c511046150a4fdc9ad912c7af390445141ba23afee597eb908901e0e334' 
  AND token = 'MaAzavdnH536U75M9X/YtLRp6Rwbm+HX7jnRR/q5IcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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