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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ee142be18d064cb91299c785a1452a772a9aca9d7b66447afba72d6975fd8c' 
  AND token = 'FO7WwPsllr4xX6Vc7sHWtrmiacwfOLsiSO7La8Hz4y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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