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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077e178178e9a09b4d9f35de642b01545e3f4b64355639cf7d07ce3f02914acd' 
  AND token = 'lG0Q1GnIqUcyKwV6t5+85ks9FNtsU5e61HAtBaeqhMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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