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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebd5b0f0fe87332d7ab24bb4989b79f43b68fb2a680d9cb7c0046e51cbc3f58' 
  AND token = 'A2xaonf6W/FURpGXrMNdtJZwmTSAkJcCpZMjobbGETk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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