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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5979eb0fd774ef1cf7b39dac0e6ce6e067e7f81307edd1e968bbfd6b704ef24f' 
  AND token = '4nR+cPpwmW9Jp93MFdjIkqJH8kKPMxMj92AyGd/ZUlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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