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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e5f0bd3be453ffae8af12c0e4d9bbfaebd6de09ac9f1a7cf793ba6761732b3' 
  AND token = 'MaRA32u2ps0sivu3JzExKMTTYuK7aWuf0zHn3B8ENAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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