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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ade8d7010077ccac7137c3f57afed2cad97de72804fd000f9dee216ae4f35c' 
  AND token = 'MZN4YiZ4R2UJ5/sNp47fAtYMYctWKVhWj0ZEy+rOyA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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