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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97120e1644f6e38134985bf7ac38f2f71c82e8aa127fa41865480c00a1d09561' 
  AND token = 'KjGYac68l7cSlqHu9cilZVW9s5NosIdZs5cLLZnXFxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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