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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b5fa514efb8ebcc792cda17db33352749087e4f44a9b10f0f2b6c14e4040c0' 
  AND token = '7g6REIZu3oD2bu6GdjAxYW0edhaqrh7V6RrA9jhsEk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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