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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1cf0b9b715b973ef60a1acb84085ac396cca1e63f86217d4c2471fec7b0c78' 
  AND token = 'xakNpx7VAZQuFsDvhFHyJ5MTGUoLAcEDKD7Y2BGIvow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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