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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a767f26a057c332c103be3e7f5fe0c282b37d091f34ed6776769ab22f4a1ecd' 
  AND token = '7vNATjIGQoRP/zraus52X+TmBeutH95SZWmW2NJhAXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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