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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1d5419908a2bf94bbc3aa1615a9a2e6c2c15e16f57e01b820664e2ad4ea16f' 
  AND token = 'cC/psE/WpjnWNhoDNUOyf2/sfNFzRCjzQpgd9ObAk2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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