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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f97e995a54774039516ccc3e1ec6d6e305304863346cb891e4d37fb3d490e6' 
  AND token = 'MuEdDrZU4FiqLZFJoz6NqUPHlCh5Vs3tJxd1YtwH34Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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