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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e95924367d93cc0a65ddb4aff996d78038cf6f3478fcd8d98e8d82ddc6c74f4' 
  AND token = 'oJy/yGEHV8XrLq3qlBOqS/kSowCDRww5R/U3Q4cueKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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