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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9329914954064998235413b8bf0113d0a00555114944941fa3fe38f5862e1309' 
  AND token = 'TQsLSplNrp6cP5NYGhpbd0UHMOFf0dYDfmgXn5Wsd8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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