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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439a5d688896385a7e51d73013d303ba169b938bca2485b85a00597066fd5976' 
  AND token = '7jb8LrkERIxAREATWjYVt1NQQ62TTyeIl4jihBM22Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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