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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05817c3736503b6a13212e5e4c5ed1bebd62bdf85c0f606ec81e64bb4c8818e6' 
  AND token = 'oJ/gcLBuEhH01bCSypt7WYHWpKZVxjPdzA/6DWgnV0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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