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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0561b48afeb8eff97c1b001683fc2b673619c1c83817cc5933a787b3c5e62d89' 
  AND token = 'FzlcPLEivlmatdfK7rdGL2U28DvLt24IHu7/c3Kz9cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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