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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3408eb5a39e1b02b11a6f5a0daf9f358ef9c3870dd0a8741a28593b7ec5a82' 
  AND token = '9qhDd1rLV1bjoQCRfWQgw+K9U0fn77w8VqplcSAAcGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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