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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146493e86da798049082b5f612508b8f9b67b919fae51dcbdd0292bbb618ee04' 
  AND token = 'Y+rqJGrgqcLFdMRrVK4gKSG4Dz5qYDD52vkEZvxS6ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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