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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26c730a49960b8dbd7ed9c5a275935a58a4119d0de9e4eb90feedc85f0a034c' 
  AND token = 'K7915S7hjv095sB/ZvoKaJCFynYjA8nmRdWDPLtdLm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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