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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6201940abe0e87bdb3c79c31d871c3fb21f9e02b7780e6af154cd8737b3bf0dc' 
  AND token = 'mRyX+zPWWwA7fiJ2vhC4e5as1/zwOPVMS7ZxddrPI/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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