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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557d5645121abbbc314b899553575534c89352d42df5a3745e74c0265670ee6f' 
  AND token = 'Yg/rtXrRhmYz6hHMIbNJn1HRr9zm7H5+5Yo5T7J7+iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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