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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3beeb5c1c429d060f12fcbbc1de1952ad8084f7b63245bb33963b5fd0a2e9aab' 
  AND token = '93ewAf2Enw7A6enWJ0Y8+f0rS0x0Pr82coIfxQAdIiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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