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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e27e7c903786adfdc7f3f74722002a90dc75ef0b907989dc96727363646ba0' 
  AND token = '3/S1u5TuLO4xeiWrrBU4FnRcoQ1espny5HTKyo1sgTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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