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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac99a9f963f86b7268bd0df9c7cb3427b704197411d801841422c18344b7eb1' 
  AND token = 'G0bcH786QDsoPMg9T4Z5/7N4MLn+P88clEGRQ3ukEbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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