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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd555757f25140781e32956a3626e2c12bb9d0ee431535e6fe39b51c069249ae0' 
  AND token = '/jvepMeyQ6+SvpqteN+/xtVOCq9c0/aJnUII/WxBDsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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