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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a792034e271c139be47dc2d7ae192ac855d6c0e5af5860b477ddb3a17c9a7254' 
  AND token = '5F4uEQrqkl7Sk9hfJMIpjTVwQpZGQnq3shRuqDLjznc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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