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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1429d13706133f4270156eabe83cd1fe6c372645ea89de98954e0790a46dbd3c' 
  AND token = 'xAg9J1cvjTwm6KKjb9vw0AkZOx6HmGyQtwToqMvFE0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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