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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f883064a2b3dc2a241e1097e6272fc32a05bf545b05a833d7ce90600f02c68b1' 
  AND token = 'ZBbfplENNpCOHb5CklTRdCxkFzX1zcAdVy8KsWJGT74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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