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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc04cc0485ca665d70e30dafc44392e605521262536f2be32c48ef9f5c569b96' 
  AND token = 'Htdk8IDzeleWmofXSyyAGkB9uvkZ6hSqU+53tuWSrI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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