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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9eddd8e75e04d3c5a0ec47b7c79d60f563c880c9a76c22cbdb585a87c1e063d' 
  AND token = 'ylE9rmkft+VeTba0iKT4ntmI9sgAHAm+G+kRV4W6lNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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