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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0b7d636e3a6814fd96fb12c2c9e2b9a62f66a91bba5a206785b51886ec78e6' 
  AND token = 'BR61nr9gCpKJ9lZwTga09ofqZWuVS3EGMOgok3kSj0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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