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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f02846045e0b5268b4e0aa8738bea7973c407555258cea79ef895d2d1d39ee' 
  AND token = 'zz5PVZgnbPM60fIqksNF3C7gBqFRR3TUsJEpdksfSVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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