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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a60bb7762f65a5fcfa8890f32412df6f3d2d0234706817942342d57096bc6bf' 
  AND token = 'eusb6syS+5u4Mi+gBq99Zfl73ARAxH6zeK0oa2C5bOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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