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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01e91ab454a865366da9dd81eb5fc7128b0907475deef30bad412ffe70da7c7' 
  AND token = 'swvBRp1pEDRpG/VErFfxGW45PUOpnXI3oV+zArCxeDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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