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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe6ac04439bcd24242d286bb0b2c39e73339b4bd52f4bd7a843628658ddeace' 
  AND token = 'd5X1ZBWCbK9+C5RraDLP9lu+lW6x+xywsSkd6paejyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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