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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbfeaa461a4fc76fe3c2e298aa766ba0dc99624fae296f06c241dd3f85f043e' 
  AND token = 'MM0hpSj96RTVCGd6jgi1/9FTB0GIVUfLPp+8ymPgNcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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