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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262f3cbb0f1d2634110c812464f8bad97cf334da628078dc9fc8ebda49f051a6' 
  AND token = 'x26+E/s31XmffP9EAGkNIj+MLn3WtFC77xmgyr1ttu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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