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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc47292dad5a317fe029a578cff373dfc8e256e554a9958fc0899f1a1ee206aa' 
  AND token = 'fQGlQWbXK1Egt9l/FTcmS1uJiQ0jvH6kM1JU+n8WnpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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