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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82beee9174eb1e6232b35454d946143da07e995dbe848f6d04f9db6c67a19d5' 
  AND token = 'tenaZeCDsixqzZ0YD4AVarIxrbevZe7cU3/G5M7tvic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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