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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6a077d08fddbc0ae2b4edacf1b23bc3d0a8c0736f8f5b34e2e8fa05a33c5a1' 
  AND token = 's3hqYzR+c7FAXHCxh7fC2GdPGyqTrvLB64YafwpRiHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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