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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1685a3e7fae5d79c9bbfa1f804b782caa298c81b12410221707cf23f729bbc' 
  AND token = 'QvXeJax1MJ0pRllZ42CaOG0OUXXOukxZbCDTcNPRQ7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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