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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eafd8b01c6b90362855c655747fa649f8a486eceff54619dc764e36096b9fa2' 
  AND token = 'qez8BowtKGWaxeZ8cF8owVOOThcfMFeIFeZjbWweRNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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