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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5fd7fd458e3f082af8aeee5ee9ba5ecd3a18cac4ca27ebabddbd0ec42f0984' 
  AND token = 'PlnbhMkMGRqjLUqWRcZC+9amKS41gGXgqSCl8p31/RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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