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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8d01f7fad2563fa8db6f81c4c186bfd63ac1a8e97c75126300eae5ef04a9d9' 
  AND token = 'i7MH6HMSlxBxfd+7Uc9GqnaQegcYs1ra82KEstAkxtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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