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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d88a56e7362fc3a2cd397640dc37831665a430479faaf891020b836ae176ad0' 
  AND token = 'LJc0KVeF8MNyPXljBPw88o6lRdgZwFa4G7oCz9KgD4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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