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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc46a7be7c7b366eb053f4c74ea3927e0cc9a70fd3a7b61a79b47188721281f' 
  AND token = 'MoOlaPuwXIe4QYDijH75Ivnziu2xweA4MK/kt0vCLoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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