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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d77107e672d371ded2f548f787c3a1c8383b38dab67cfa9080195ac6311d07c' 
  AND token = '/BEgp5ePf/FEGLHUn0C7Eyxip8UlC7IiO8lIzREj8Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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